CN105332927A - Integrated magnetic pump based on axial dual motor driving - Google Patents

Abstract

An integrated magnetic pump based on axial dual motor driving comprises a pump body, an impeller, a pump shaft, a permanent magnet rotor and an electromagnetic stator, wherein the pump body comprises a front housing, an intermediate housing and a rear housing; the inner side of the pump body is divided into a front cavity and a rear cavity through the intermediate housing; the impeller is mounted in the front cavity; the permanent magnet rotor is mounted in the rear cavity; the impeller and the permanent magnet rotor are integrally connected through the pump shaft; the electromagnetic stator comprises a left stator and a right stator which are oppositely mounted at the left side and the right side of the rear cavity, and the left stator and the right stator are circumferentially arranged along the pump shaft; the permanent magnet rotor is mounted between the left stator and the right stator; the left stator and the right stator are correspondingly sealed through a separating plate and a separating sleeve and are separated from the permanent magnet rotor. According to the integrated magnetic pump based on the axial dual motor driving, the axial length and the size of the pump body are reduced; the impeller torque is increased; the vibration is reduced; the size is small under the same output power requirement.

Description

An integrated magnetic drive pump driven by axial dual motors

technical field

The invention relates to a magnetic pump, in particular to an integrated magnetic pump driven by axial double motors.

Background technique

As a non-leakage pump, the magnetic pump is widely used in the fields of medicine, chemical industry, petrochemical and other fields for pumping non-aqueous media.

Existing magnetic pumps are often composed of three parts: motor, magnetic driver and pump. Among them, the magnetic driver is composed of outer magnetic rotor, inner magnetic rotor and non-magnetic isolation sleeve; the inner magnetic rotor is connected with the pump rotor and is located in the isolation sleeve. In the closed space formed by the pump body; the outer magnetic rotor is connected with the motor rotor and is located outside the isolation sleeve. The magnetic pump adopts the magnetic drive mechanism to change the dynamic seal of the ordinary water pump into a static seal through the isolation sleeve to prevent leakage and completely isolate the inside and outside of the pump. It is widely used in fluid pumping in harsh fields such as poisonous and corrosive. However, this type of magnetic pump has a large volume and weight, complex structure, high cost, and troublesome maintenance of the magnetic drive mechanism. With the development of society and the upgrading of technology in various fields, people's requirements for magnetic pumps are getting higher and higher, and the existing magnetic pumps with large weight and volume are difficult to meet people's needs.

In order to overcome these shortcomings, the active permanent magnet rotor of the magnetic drive mechanism can be replaced by an electromagnetic stator, and the driven permanent magnet rotor can be directly used as the motor rotor to realize the integration of the machine and the pump, thus completely changing the design idea of the original magnetic drive pump. Therefore, based on this principle, many relevant documents have been published one after another. For example, the document: CN104153999A discloses a miniature high-speed magnetic pump integrated with a machine and a pump. By installing a permanent magnet on the outer circumferential surface of the back cover of the impeller, the permanent magnet and the stator winding form a radial motor, thereby realizing the integration of the machine and pump. In order to reduce the volume and weight of the magnetic pump; the document CN104179693A discloses a magnetic pump, by setting the impeller with a central shaft, and installing "tube-shaped" permanent magnet rotors on both sides of the central shaft, using the permanent magnet rotor and the stator The rotation between drives the impeller. However, the permanent magnet rotors used in these two documents are all in the form of a "cylindrical" structure with a large structure, so that the size of the entire magnetic drive pump is restricted by the permanent magnet rotor, so there are still problems in reducing volume and weight. Much room for improvement. Moreover, the magnetic pump disclosed in the document CN104179693A adopts a "cylindrical" permanent magnet rotor, which results in a larger axial dimension of the central shaft for installing the permanent magnetic rotor, thereby making the axial dimension of the entire magnetic pump larger .

Contents of the invention

The object of the present invention is to provide an integrated magnetic pump driven by axial dual motors with smaller volume, lighter weight and more compact overall structure under the same output power in order to overcome the above-mentioned shortcomings of the prior art.

In order to achieve the above object, the technical solution adopted in the present invention is: an integrated magnetic pump driven by axial dual motors, including a pump body, an impeller, a pump shaft, a permanent magnet rotor and an electromagnetic stator; the pump body includes a pump The front casing, the middle casing of the pump body and the rear casing of the pump body; the middle casing of the pump body divides the inside of the pump body into two chambers, the front and the rear; the impeller is installed in the front chamber, and the permanent magnet rotor is installed in the rear chamber; the impeller and The permanent magnet rotors are connected together through the pump shaft; the electromagnetic stator includes a left stator and a right stator; the left stator and the right stator are relatively installed on the left and right sides of the rear chamber; the left stator and the right stator are arranged circumferentially along the pump shaft; The magnetic rotor is installed between the left stator and the right stator; the left stator and the right stator are respectively sealed by a partition and a spacer, and are isolated from the permanent magnet rotor.

Further, the left stator is inlaid on the middle shell of the pump body; the right stator is inlaid on the rear shell of the pump body.

Further, the partition is fixed on the concave wall of the rear chamber side of the middle shell of the pump body to isolate the left stator from the fluid in the rear chamber; the spacer is fixed to the front of the pump body together with the middle shell of the pump body and the rear shell of the pump body housing, fluidly isolating the right stator from the rear chamber.

Further, permanent magnets cooperating with the left stator and the right stator are embedded in the permanent magnet rotor along the circumferential direction.

Further, a fluid inlet and a fluid outlet are opened on the front shell of the pump body.

Further, the left stator and the right stator have the same structure, including a stator yoke and an excitation coil; the stator yoke is made of laminated silicon steel sheets; the stator yoke is laminated radially relative to the pump shaft ; The excitation coil is wound around the yoke of the stator yoke.

Further, the pump shaft is installed in the shaft hole of the middle casing of the pump body through a bearing.

Further, the permanent magnet is an annular permanent magnet.

The principle of the present invention is: the left stator and the right stator form an electromagnetic stator, and the permanent magnet rotor is inlaid with a ring-shaped permanent magnet, so that the electromagnetic stator and the permanent magnet rotor between the electromagnetic stator form an axial motor. The axial motor gives the permanent magnet rotor a circumferential force by rotating the magnetic field in the circumferential direction, so that the pump shaft rotates; when the pump shaft rotates, it drives the impeller mounted on it to rotate, and then the magnetic pump starts to work. The method adopted in the present invention forms an axial motor with a permanent magnet rotor and an electromagnetic stator; the axial motor has lower requirements on the axial length of the pump shaft, so it is similar to the "barrel type" radial motor described in document CN104179693A It does not need a longer pump shaft to support, thereby reducing the axial length of the pump shaft, thereby reducing the size of the entire magnetic pump; and, the present invention is to form two permanent magnet rotors, a left stator and a right stator. The axial motor increases the output power and ensures that the magnetic pump is smaller and lighter at the same output power.

In addition, the diaphragm and the pump body middle shell, the spacer and the pump body rear shell isolate the electromagnetic stator, so that the liquid does not enter the electronic winding of the motor, and the mechanical seal (dynamic seal) becomes a static seal of the sealing ring.

Compared with the prior art, the present invention has the following characteristics:

1. The present invention embeds the annular permanent magnet on the rotor along the circumferential direction, and forms an axial motor with the electromagnetic stator, which reduces the axial length, reduces the volume and weight of the magnetic pump, and realizes the integration of the machine and the pump;

2. Driven by biaxial motors, the rotational force is increased, the axial force is reduced, and noise is reduced. The volume of the invention is smaller under the same pumping power requirement.

The detailed structure of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 - is the structural representation of the present invention.

In the figure: 1-pump body, 2-impeller, 3-pump shaft, 4-permanent magnet rotor, 5-electromagnetic stator, 6-baffle, 7-spacer, 8-permanent magnet, 9-bearing, 11-pump Body front shell, 12-pump body middle shell, 13-pump body rear shell, 51-left stator, 52-right stator, 111-fluid inlet, 112-fluid outlet.

detailed description

As shown in the figure, an integrated magnetic pump driven by axial dual motors includes a pump body 1, an impeller 2, a pump shaft 3, a permanent magnet rotor 4 and an electromagnetic stator 5; It is composed of the front casing 11 of the pump body, the middle casing 12 of the pump body and the rear casing 13 of the pump body; the middle casing 12 of the pump body divides the inside of the pump body into two chambers, front and rear; the electromagnetic stator 5 consists of a left stator 51 and a right stator 52 Composition; the front end of the pump body front shell 11 is provided with a fluid inlet 111 communicated with the front chamber, and the top of the pump body front shell 11 is provided with a fluid outlet 112 communicated with the front chamber; the pump body middle shell 12 and the pump body rear shell 13 is oppositely inlaid with a left stator 52 and a right stator 52 arranged circumferentially along the pump shaft 3 .

There is an impeller 2 in the front chamber, and a permanent magnet rotor 4 matched with the left stator 51 and the right stator 52 in the rear chamber; the left stator 51 and the right The stator 52 is sealed by the separator 6 and the spacer 7 respectively, and is isolated from the permanent magnet rotor 4; the impeller 2 is fixed on the pump shaft 3, and the permanent magnet rotor 4 is also fixed on the other end of the pump shaft 3, and the pump shaft 3 It is installed in the shaft hole of the shell 12 in the pump body through the bearing 9.

The left stator 51 and right stator 52 embedded in the oppositely arranged pump body middle shell 12 and pump body rear shell 13 are located on the left and right sides of the rear chamber, and the partition plate 6 is fixed to the rear chamber of the pump body middle shell 12 On the inner concave wall of the side, and isolate the left stator 51 from the fluid in the rear chamber, the front end periphery of the spacer 7 is fixed to the pump body front shell 11 together with the periphery of the pump body middle shell 12 and the pump body rear shell 13, And the right stator 52 is fluidly isolated from the rear chamber.

A permanent magnet 8 cooperating with the left stator 51 and the right stator 52 is embedded on the permanent magnet rotor 4 along the circumferential direction; the permanent magnet 8 is an annular permanent magnet.

The left stator 51 and the right stator 52 have the same mechanical structure, that is, the stator yoke and the excitation coil, and the stator yoke is made of laminated silicon steel sheets, and is radially laminated relative to the pump shaft, and the excitation coil is wound on The yoke portion of the stator yoke.

Sealing rings are arranged between the front shell 11 of the pump body and the middle shell 12 of the pump body, the middle shell 12 of the pump body and the partition plate 6, the middle shell 12 of the pump body and the spacer 7, and the spacer 7 and the rear shell 13 of the pump body. The separator 6 and spacer 7 isolate the delivery liquid of the magnetic pump so that the liquid does not enter the left stator 51 and the right stator 52, and the dynamic seal is changed to a static seal.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (8)

1. An integrated magnetic pump driven by axial dual motors, including pump body (1), impeller (2), pump shaft (3), permanent magnet rotor (4) and electromagnetic stator (5); the pump The body (1) includes the pump body front shell (11), the pump body middle shell (12) and the pump body rear shell (13); the pump body middle shell (12) divides the inner side of the pump body into two chambers, front and rear; The impeller (2) is installed in the front chamber, and the permanent magnet rotor (4) is installed in the rear chamber; the impeller (2) and the permanent magnet rotor (4) are connected together through the pump shaft (3); it is characterized in that: the electromagnetic The stator (5) includes a left stator (51) and a right stator (52); the left stator (51) and the right stator (52) are relatively installed on the left and right sides of the rear chamber; the left stator (51) and the right stator (52) Arranged along the circumference of the pump shaft (3); the permanent magnet rotor (4) is installed between the left stator (52) and the right stator (52); the left stator (51) and the right stator (52) are separated by the separator (6) It is sealed with the spacer (7) and isolated from the permanent magnet rotor (4). 2. The integrated magnetic drive pump driven by axial dual motors according to claim 1, characterized in that: the left stator (51) is embedded in the middle casing (12) of the pump body; the right stator (52) is embedded in the on the rear casing (13) of the pump body. 3. The integrated magnetic pump driven by axial dual motors according to claim 1 or 2, characterized in that: the partition (6) is fixed on the inner concave wall of the rear chamber side of the middle shell (12) of the pump body , the left stator (51) is isolated from the fluid in the rear chamber; the spacer (7) is fixed to the pump body front shell (11) together with the The stator (52) is fluidly isolated from the rear chamber. 4. The integrated magnetic pump driven by axial dual motors according to claim 3, characterized in that: the permanent magnet rotor (4) is embedded with a left stator (51) and a right stator (52) along the circumferential direction ) matching permanent magnet (8). 5. The integrated magnetic pump driven by axial dual motors according to claim 1 or 2, characterized in that: the front casing (11) of the pump body is provided with a fluid inlet (111) and a fluid outlet (112) . 6. The integrated magnetic drive pump driven by axial dual motors according to claim 3, characterized in that: the left stator (51) and the right stator (52) have the same structure; both include stator yokes and excitation The coil; the stator yoke is made of laminated silicon steel sheets; the stator yoke is laminated radially relative to the pump shaft; the excitation coil is wound around the yoke of the stator yoke. 7. The integrated magnetic pump driven by axial dual motors according to claim 1 or 2, characterized in that: the pump shaft (3) is installed on the shaft of the pump casing (12) through a bearing (9) in the hole. 8. The integrated magnetic drive pump driven by axial dual motors according to claim 4, characterized in that: the permanent magnet (8) is an annular permanent magnet.